how far away is the thunder we hear
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What causes thunder? Thunder is a compression wave and will dissipate with time and distance. Under excellent conditions, thunder can be heard about 12 miles away from the lightning strike. However most of the time conditions aren’t this good and we usually can’t hear thunder any more than about 5 miles away.
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Preparing Your Trip Thunder travels at about one mile for every five seconds or, one kilometre for every three seconds. If the wind changes in a clockwise direction, fair weather is on the way. If the wind changes in a counterclockwise direction, fair weather is leaving. Doubling of wind speed quadruples its strength.
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Planning ahead When thunder roars, go indoors. If you can hear thunder, you are close enough to be struck by lightning. There is no place outside that is safe from a lightning strike. Remaining indoors for 30 minutes after seeing the last lightning and hearing the last thunder will eliminate the risk at the end of storms.
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Lightning Distance Calculator The formula is to divide the number of seconds by the speed of sound in feet per second. The delay between when you see lightning and when you hear thunder occurs because sound travels much, much slower than light. Sound travels through air at about 1100 to 1200 feet per second (our default is 1150). That is a little more than one mile per five seconds.
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How far can a storm be to actually hear thunder? Lightning can strike up to 16 Km (10 miles) from a thunderstorm so if im not mistaking since you can hear thunder another 10 miles from lightning, then im guessing you can hear thunder if a storm was around 20 miles away.
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How do I tell how far away a thunderstorm is? A 'thunder-clap', or the noise our ears hear (ranging from a sharp crack for nearby, short path-length lightning strikes to a long, low rumble for a distant, long path-length discharge), is caused by the rapid expansion (due to heating) of air in the lightning channel that the stroke passes through.
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Lightning A lightning flash preceding its thunder by one second would be approximately 350 metres (0.22 mi) in distance; a delay of three seconds would indicate a distance of about one kilometer (0.62 mi) (3×340 m). A flash preceding thunder by five seconds would indicate a distance of approximately one mile (1.6 km) (5×340 m).
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Lightning kills more than hurricane or tornadoes. Lightning safety For example, if you see lightning and it takes 15 seconds before you hear the thunder, then the lightning is 3 miles (5 kilometers) away from you (15 divided by 5 = 3 miles, too close!). Do not resume outdoor activities until 30 minutes after the last thunder clap.
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Definitions &Translations The charged regions in the atmosphere temporarily equalize themselves through this discharge referred to as a strike if it hits an object on the ground. Although lightning is always accompanied by the sound of thunder, distant lightning may be seen but be too far away for the thunder to be heard.
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How to Estimate Lightning's Distance Normally, thunder can be heard up to 10 miles from the lightning that makes it. Lightning heats the air around it to as much as 60,000 degrees, producing sound waves by the quick expansion of the heated air. Since light travels at 186,000 miles per second, you see the lightning the instant it flashes. But sound, including thunder, travels about a mile in five seconds near the ground. If 15 seconds elapse between seeing a lightning bolt and hearing its thunder, the lightning was about three miles away.
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- To judge how close lightning is, count the seconds between the flash and the thunderclap. 1  Each second represents about 300m (984.25ft). 2  Thunder is not only heard during thunderstorms. It is uncommon, but not rare, to hear thunder when it is snowing. 3  Lightning does not always create thunder.
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- No there is not, Heat Lightning is really just lightning in a distant storm. The reason you can't hear it is because the sound of thunder can travel approximately 25 miles. When light can travel a lot farther.
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Speed of Thunder The next time you see a flash of lightning count the number of seconds before the thunder arrives, then divide this number by five to find out how far the lightning is away. If it takes 10 seconds for the thunder to roll in, the lightning struck about 2 miles away (3 kilometers away).
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Lightning Sound travels through air at about 340 m/s. An observer can approximate the distance to the strike by timing the interval between the visible lightning and the audible thunder it generates. A lightning flash preceding its thunder by five seconds would be about one mile (1.6 km) (5x340 m) distant.
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What Causes Thunder? These 10 animal facts will amaze you. Thunder is caused by the sudden expansion of the air around a lightning bolt's path. The deep rumbling and sharp cracks of thunder are produced as the air around the lightning bolt is superheated — up to about 54,000° Fahrenheit (about 33,000° Celsius) — and rapidly expands. This rapid expansion creates an acoustic shock wave that manifests itself as thunder. The closer the lightning is, the louder the clap of thunder will seem to be. Lightning is a discharge of electricity in the atmosphere.
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Lightning Warning Signs You Shouldn't Ignore Audible thunder. Thunder is the sound created by lightning, so if thunder can be heard, lightning is near. You can determine how near (in miles) by counting the number of seconds between thunderclaps and dividing that number by 5. A severe thunderstorm warning.
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What is the difference between lightning and thunder? In fact you can measure the distance from you to the lightening in this way: for each second delay between seeing it and hearing it, the lightening bolt is approximately 300 meters, or 1000 ft away. Thunder is merely the rumbling sound that lightning creates.
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Lightning Lightning can strike as much as 10 miles away from the rain area in a thunderstorm. That is about the distance that you are able to hear the thunder from the storm. If you can hear the thunder from a storm, you are close enough to be struck by lightning.
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Thunder Therefore, the lightning is approximately one kilometer distant for every 3 seconds that elapse between the visible flash and the first sound of thunder (or one mile for every 5 seconds). In the same five seconds, the light could have traveled the Lunar distance four times.
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Lightning Distance Calculator So, for example, if you counted 30 seconds between the lightning and the thunder, you can estimate that the lightning was about 6 miles away, since 30 divided by 5 = 6. Enter the number of seconds from the flash of lightning until you hear the start of the thunder rumble.
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Lightning strike The flash of a lightning strike and resulting thunder occur at roughly the same time. But light travels 300,000 kilometers in a second, almost a million times the speed of sound. Sound travels at the slower speed of 344 m/s, so the flash of lightning is seen before thunder is heard.
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Can you calculate how far away lightning struck by thunder? So sound travels 1 kilometer in roughly 3 seconds and 1 mile in roughly 5 seconds. When you see the flash of a lightning bolt, you can start counting seconds and then divide to see how far away the lightning struck. If it takes 10 seconds for the thunder to roll in, the lightning struck about 2 miles or 3 kilometers away.
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If you can hear thunder are you close enough to get struck by lightng in a thunder storm? The thunder you hear from a distant bolt of lightning is caused by the sudden increase in pressure and temperature of the air through which lightning passes, which expands rap … idly and produces a sonic boom.
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- The Science Behind Determining How Far Away The Thunder Storm Is. Lightning and thunder take place at the same time, but light and sound travel to us at different. speeds, so they reach us at different times. Light travels at 186,000 miles per second, so it only. takes a fraction of a second to reach us.
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What is the approximate distance of a thunderstorm if you notice a three-second delay between the flash of lightning and the sound of the thunder? Using the average speed of sound in air (343 m/sec or about 1125  ft/sec), the distance would be 1029 meters (3376 ft.).    *The English value used is 1000 feet per se…cond, although 1100 feet  per second is a better approximation.
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The Science of Thunder The flash-to-bang method of protection considers the time between seeing lightning to hearing its thunder. Light from lightning travels at the speed of 186,000 miles per second (300,000 km/second), arriving at the observer in about 10 microseconds when the strike point is 1.85 miles (3 km) away.